
NEPTUNE 5 FA
8  | Troubleshooting | 
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8.1 Indications on Display | 
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Indication  | 
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on Display  | 
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FLF | 
  | >  | Flow sensor fault  | 
  | Contact Nilfi   | 
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  | Cold water operation possible  | |||
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FLO | 
  | >  | Water supply turned off or inadequate supply  | •  | Required volume fl ow and pressure see  | 
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  | to machine  | 
  | chapter 9.4 Technical Data  | 
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  | >  | Detergent tank empty  | •  | Fill detergent tank or set detergent me-  | 
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  | tering to „OFF“  | 
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  | >  | Pressure regulation on the safety control  | •  | Turn the twist grip on safety control block  | 
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  | block set to low water volume  | 
  | to higher water pressure/volume  | 
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  | >  | Machine scaled  | 
  | Contact Nilfi   | 
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Fue | 
  | >  | Fuel shortage  | •  | Fill fuel tank  | 
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  | Cold water operation possible  | ||
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Hop | 
  | >  | Motor overheated  | •  | Turn main switch in position „OFF“, let  | 
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  | machine cool down  | |
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  | •  | Remove extension cord, if being used.  | 
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  | •  | Possible phase failure; have electrical  | 
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  | connections checked  | 
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HOS | 
  | >  | Machine overheated  | 
  | Contact Nilfi   | 
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  | >  | Leakage or inadmissible operating condition  | •  | After three times of   | 
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  | the machine switches off. To reset: Turn  | 
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  | main switch to position “OFF“, then start  | 
LEA | 
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  | again. Keep trigger squeezed for longer  | 
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  | than 3 seconds. If a leak occurs in the  | |
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  | hose and gun and causes the machine  | 
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  | to start and stop briefl y 3 times, then the  | 
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  | machine will switch off.  | 
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  | >  | Spray gun leaking  | •  | Repair Spray gun  | 
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  | >  | High pressure hose, coupling or line system  | •  | Replace   | 
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  | leaking  | 
  | screw fi ttings  | 
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  | >  | Detergent tank empty  | •  | Fill detergent tank or set detergent me-  | 
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  | tering to „OFF“  | 
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  | >  | Water inlet fi lter dirty  | •  | Clean fi lter (see chapter 7.2.1)  | 
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  | >  | •  | Repair leaks  | |
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LHE | 
  | >  | Flame sensor sooted  | •  | Clean flame sensor (see chapter  | 
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  | > Ignition or fuel system failure  | 
  | Contact Nilfi   | |
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  | Cold water operation possible  | 
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LHL | 
  | >  | Burner failure  | 
  | Contact Nilfi   | 
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  | Cold water operation possible  | |||
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POL | 
  | >  | Pump oil low  | •  | Fill to proper level (see chapter 7.2.3)  | 
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SEC  | 
  | >  | Temperature sensor damaged  | 
  | Contact Nilfi   | 
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  | Cold water operation possible  | |||
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SEO  | 
  | >  | Temperature sensor damaged  | 
  | Contact   | 
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  | Cold water operation possible  | |||
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UPC | 
  | >  | Microprocessor failure  | 
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1) Options / model variants  | 17  | 
Original instructions